EP1151951A2 - Method for operating a textile machine producing crosswound bobbins - Google Patents

Abstract

On reaching a set number of thread joining operations, in relation to a predetermined reference thread length, the winding process is stopped and the length of wound thread concerned, is removed from the cross winding bobbin (4). Preferred features: The reference length with an excessive number of joins, is disposed of through a suction nozzle (22) at each working location. The suction opening (23) accepting the thread (27) for disposal, is swung in close to the surface (20) of the cross wound bobbin

Description

The invention relates to a method according to the preamble of Claim 1.

As is known, yarn that has been produced on a textile machine upstream of the production process, preferably a ring spinning machine, and is present on relatively small-volume spinning bobbins, is rewound to form substantially larger package carriers, so-called cross-wound bobbins.
In this rewinding process, the yarn is also continuously checked for possible yarn defects by a yarn cleaner, as explained in detail in DE 196 40 184 A1, for example. Detected yarn defects are cleaned up immediately.
This means that if the yarn cleaner detects a yarn defect, a controlled thread cut is carried out immediately by a thread separating device arranged in the area of the yarn cleaner. The resulting bobbin thread is fixed in a thread tensioner and kept ready for a subsequent thread connection process, while the upper thread, which contains the yarn defect, first runs onto the package.
Simultaneously with the cutting of the thread, the package is lifted from its associated drive drum and braked to a standstill by a corresponding bobbin brake.
The upper thread running onto the surface of the package is taken up by a suction nozzle. This means that the mouth of the suction nozzle is positioned in the area of the package surface and the package is slowly rotated in the unwinding direction. After the defective thread piece has been cleaned, the picked up upper thread is reconnected in a splicing device to the lower thread, which was previously inserted into the splicing device through a hook tube.

Although the resulting thread splice is almost represents a thread-like connection in a later Tissue is barely visible, there are packages in which one predetermined number of such thread splices exceeded is used by subsequent processing companies, for example Weaving mills, often viewed as inferior bobbins, their Manufacturing should be avoided if possible.

A winding machine is known from EP 0 628 509 B1, in which the running thread, as usual, is continuously checked for thread defects by a thread cleaner.
In this known device, the thread length drawn from the spinning cop is also continuously recorded.

If the number of detected thread defects, based on a certain amount of thread to be wound, exceeds an adjustable number, the winding process is stopped and the thread is cut.
Using a special suction device, a predeterminable amount of thread is then sucked out of the spinning cop and disposed of.
This means that this known method assumes that there is only a relatively limited amount of defective thread on a spinning cop, which is removed by the above-described suction action.

Then the bobbin thread coming from the spinning cop again, as usual, in an appropriate splicer connected to the upper thread retrieved from the package and the rewinding process continued.

However, this known method has the serious disadvantage that spinning cops often also consist of faulty thread material, so that faulty yarn continues to be wound up even after the suction action.
In addition, it is disadvantageous in this known method that in any case the amount of thread, which has been cleaned but has a disproportionate number of thread connections, remains on the package.

Starting from the aforementioned prior art, the Invention based on the object of developing a method this ensures that only packages are manufactured at which the number of thread connections per associated reference thread length does not exceed an adjustable number.

According to the invention, this object is achieved by a method as described in claim 1.

Advantageous embodiments of the invention are the subject of Subclaims.

The method according to the invention has the particular advantage that it is always ensured that the packages produced each have only a certain, adjustable, tolerable number of yarn connections.
This means that the use of the method according to the invention ensures that the packages are always of a certain minimum quality level, at least as far as the number of their thread connections is concerned.

In a preferred embodiment, as set out in claim 2, it is provided that both the spooled yarn length and the number of yarn joining operations that have occurred are monitored by the job computer of the job in question.
This means that the existing workstation computer is revised in software so that it can also take on additional functions.

According to claim 3, the number of those on a particular one Yarn length acceptable joining operations as well Reference yarn length concerned on a central control unit of the Textile machine adjustable.

Because this central control unit with all workstation computers communicates, it is simple and quick, for example, by "downloading" the relevant one Setting data, possible, both the number of tolerable Connection processes as well as the associated reference yarn length to change or correct.

In principle, however, it is also possible to enter the relevant setting data directly on the individual workstation computers.
Such a method can be recommended, for example, if several batches with different quality requirements for the packages are processed on a winding machine (claim 4).

As stated in claim 5, it is further provided in an advantageous embodiment of the invention that the reference yarn length recognized as being defective is disposed of by the suction nozzle of the job in question if necessary.
In this case too, existing "hardware" is used almost cost-neutral for an additional purpose.

Further details of the invention are as follows based on a drawing embodiment removable.

Fig. 1

schematisch eine Seitenansicht einer Arbeitsstelle einer Kreuzspulen herstellenden Textilmaschine, die zur Herstellung des erfindungsgemäßen Verfahrens geeignet ist, während des regulären Spulbetriebes,

Fig. 2

die Arbeitsstelle gemäß Figur 1, während die fehlerhafte Garnlänge durch die Saugdüse der Arbeitsstelle entsorgt wird.

It shows:

Fig. 1

schematically shows a side view of a work station of a textile machine producing cross-wound bobbins, which is suitable for producing the method according to the invention, during regular winding operation,

Fig. 2

the workplace according to Figure 1, while the faulty yarn length is disposed of by the suction nozzle of the workplace.

In Figure 1, a job 1 is schematically one so-called cross winder shown. Such Automatic winding machines usually have a large number in series arranged workplaces 1. At these jobs 1 are spools 3 (spinning heads) too large Rewinds 4 (cheese) rewound.

During the rewinding process, which is indicated in FIG. 1, is withdrawn from the spinning cop 3 thread 2 by a Thread cleaner 29 continuously for possible thread defects checked.

Such workplaces 1 of an automatic winder have as known and therefore only indicated schematically, in each case different actuators and sensors that one enable proper rewinding process.

Each work station 1 has, for example, a gripper tube 5 for receiving a lower thread 6, which is fixed in a thread tensioner 13 in particular in the case of a controlled thread cut by the thread cutting device 34.
To restore a thread connection, a thread splicing device 8 is also provided, which is arranged somewhat outside the regular thread path.

On its way to the package 4, the thread crosses 2 moreover, as already indicated above, one Thread cleaner 29 and a thread cutting device 34.

The winding device of such a work station 1 consists essentially of a pivotably mounted bobbin frame 15 for rotatably holding a package 4 and a thread guide drum 14 for driving the package 4 by friction.
The thread guide drum 14 also ensures that the thread 2 is wound in crossing layers.
As indicated in FIGS. 1 and 2, the bobbin frame 15 is fixed on the bobbin case 17 so that it can move to a limited extent via a pivot axis 16.
The thread guide drum 14 is acted upon by a (not shown) speed-controllable, reversible drive, as is known for example from DE 43 36 312 A1. In the area of the thread guide drum 14, a sensor device 32, 33 is also arranged, which enables the wound thread length to be measured.

That is, on the rotating bearing shaft 31 Thread guide drum 14 is preferably a magnet wheel 32 attached, which, evenly distributed over its circumference, one has a certain number of magnetic poles, the passing of which detected by a stationary sensor 33 and via a appropriate signal line to the working or Bobbin computer 9 is forwarded. in the Job computer 9, the number of pulses detected counted and from this the length of the wound thread 2 calculated.

Instead of a magnet wheel sensor device are used to detect the Length of the wound thread of course also other Sensor devices can be used.

As can also be seen from FIG. 1, in addition to the gripper tube 5 already mentioned at the beginning, which is movable about a pivot axis 10, each work station 1 also has a suction nozzle 22, the mouth 23 of which, as indicated in FIG is.
The suction nozzle 22 is rotatably supported to a limited extent about a pivot axis 24 and is connected via a vacuum line 25 to a preferably machine-long suction channel 12. In addition, the suction nozzle 22 has an internal sensor device 28 for detecting a sucked-in upper thread 27.

As can also be seen from FIGS. 1 and 2, this is also Gripper tube 5 via a corresponding vacuum line 11 the suction channel 12 connected.

Process sequence according to the invention:

During the "normal" winding process, a thread 2 is drawn off from a supply bobbin 3 and wound up into a large-volume cross-wound bobbin 4, which is rotatably mounted between the arms of a bobbin frame 15.
The cheese 4 is driven by frictional engagement of a thread guide drum 14, which also ensures that the thread 2 is deposited in a crosswise manner.

On its way to the package 4, the thread passes under 2 other a thread tensioner 13, which, as is known, during the Guaranteed winding process a defined winding tension. The thread 2 also passes a thread cleaner 29 as well a thread separator 34, both of which have corresponding Signal or control lines with the Job computer 9 connected to the winding station concerned are. The length of thread wound during the winding process is detected via the sensor device 32, 33, the is also connected to the workstation computer 9.

As soon as the thread cleaner 29, for example in a so-called cleaner measuring head is integrated and the current Thread 2 is permanently scanned, a thread error, for example a thick or thin spot, also becomes one arranged within the cleaner measuring head Thread separating device 34 initiates the thread 2 cuts.

The job computer 9 also ensures that the Cross-wound bobbin 4 is lifted off the thread guide drum 14 and both the cheese 4 and the Thread guide drum 14 are braked to a standstill.

Since the lower thread 6 is generally fixed in the thread tensioner 13 in the case of a controlled thread cut, the lower thread 6 can be inserted into the splicing device 8 relatively easily by means of the hook tube 5.
The looper tube 5 is pivoted from the thread take-up position indicated in FIG. 1 into the thread insertion position shown in FIG. 2.

The upper thread 27, which also contains the thread defect, has run up after the thread cut onto the surface 20 of the package 4 and is picked up by the suction nozzle 22, which is pivoted with its mouth 23 into the area of the surface 20 of the package 4. As usual, the thread guide drum 14 is also rotated backwards in the direction of arrow 19 and thus the cheese 4 in the unwinding direction 21. In the case of a "normal" thread break or a "normal thread cut, only enough thread length is sucked off by the suction nozzle 22 to ensure that the thread defect has been removed. Then the suction nozzle 22 also places the cleaned upper thread 27 in the splicing device 8, where the both ends of the thread, after appropriate preparation, be spliced.
The splicing device 8 is also connected to the workstation computer 9 via corresponding control lines and is controlled in a defined manner by the latter.

That means both those between two Thread joining operations wound thread length as well the number of thread joining operations are in Job computer 9 of the winding unit concerned saved.

Via a central control unit 30 of the textile machine, which with the individual workstation computers 9 of the winding units connected, it can be specified how much Thread joining operations on a specific thread length should be permissible if the cheese to be produced 4 should meet a certain quality standard.

That is, if the job computer 9 determines that on the set reference thread length the number of permissible thread connection processes is exceeded the job computer 9 automatically ensures that the already wrapped reference yarn length completely from the Cheese 4 is removed.

For this purpose, similar to a "normal" Thread cut or thread break, the suction nozzle 22 to the Surface 20 of the cheese 4 pivoted and the cheese through the thread guide drum 14 in the unwinding direction 21 acted upon. As soon as one inside the suction nozzle 22 arranged sensor device 28 detects that a thread end is present, that is, the upper thread 27, which is a plurality of thread connections, is captured by means of Suction nozzle 22 sucked the reference yarn length and disposed of.

Through the sensor device 32, 33 or the Job computer 9 is monitored that at least such a length of thread is unwound from the package 4, which corresponds to the set reference thread length.

After the suction of the thread length described above, the Upper thread 27, as usual, inserted into the splicing device 8 and there pneumatically with the already ready Bobbin thread 6 connected.

Then the "normal" winding process with a "cleaned" cheese continues.

Claims (5)

Process for operating a textile machine producing cross-wound bobbins, on the workstations of which yarn is unwound from supply bobbins, checked, yarn defects are cleaned out and the yarn is wound into large-volume cross-wound bobbins, the yarn defects occurring during the winding process being recorded on a predetermined length of thread being recorded,
characterized in that when a predeterminable number of yarn connection processes, based on a presettable reference yarn length, is reached, the winding process is stopped and the relevant, already wound-up yarn length is removed again from the tool spool (4). A method according to claim 1, characterized in that the number of yarn connection operations that have occurred and the yarn length being wound simultaneously are monitored by the workstation computer (9) of the relevant workstation (1). Method according to claims 1 and 2, characterized in that the number of tolerable yarn connection processes and the associated reference yarn length can be set via a central control unit (30) of the textile machine. Method according to one of the preceding claims, characterized in that the number of tolerable yarn connection processes and the associated reference yarn length can be set via the winding station computer (9) of the relevant work station (1). Method according to one of the preceding claims, characterized in that the reference yarn length having too many yarn connection processes is disposed of by a suction nozzle (22) at the work station, the suction opening (23) of which for receiving the upper thread (27) in the region of the surface (20) of the Cheese (4) is swung in.

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